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This section describes how to use the HDT to program and/or verify the program-
ming of Ports 5A and 5B, but only if they are being used as pressure ports. Ports 5A
and 5B only need to be programmed when the Interface Module has been replaced or
if it was found during troubleshooting that the port is incorrectly programmed.
Pressure ports 1A and 1B are always programmed for Air Tank 1 and Air Tank 2 and
cannot be changed with the HDT.
Note:
If the port is already being used as an Air Restriction or Fuel Restriction
port, it cannot be reprogrammed to a pressure port.
1. With the ignition off, connect the HDT to the vehicle's diagnostic connector using
the appropriate adapter as shown in Figure 6-2. The diagnostic connector is usu-
ally located under the dash on the driver's side.
2. Turn the ignition on. The HDT will look for the Interface Module and try to es-
tablish communications with it while displaying:
Typically, this takes less than 30 seconds but can take up to 2 minutes.
a.
If communications are established, the HDT will display:
b. If communications are not established after 2 minutes, repeat this proce-
dure starting at Step 1 with the ignition off. If the HDT fails to establish
communications after three attempts, a problem may exist with the J1708
data bus. In this case, choose the symptom from Chapter 5 that best de-
scribes the original instrument system failure and follow the trouble-
shooting procedures.
3. After communications are established, read the configuration data by pressing
the Select key. The HDT will display:
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